Papers

Benjamin J. Brown, Sam Roberts·Nov 28, 2018

Certain physical systems that one might consider for fault-tolerant quantum computing where qubits do not readily interact, for instance photons, are better suited for measurement-based quantum-computational protocols. We develop a framework to map f...

E. Z. Cruzeiro, N. Gisin·Nov 28, 2018

We give the complete list of 175 facets of the local polytope for the case where Alice and Bob each choose their measurements from a set of four binary outcome measurements. For each inequality we compute the maximum quantum violation for qubits, the...

Pablo Andr'es-Mart'inez, C. Heunen·Nov 27, 2018

Quantum algorithms are usually described as monolithic circuits, becoming large at modest input size. Near-term quantum architectures can only manage a small number of qubits. We develop an automated method to distribute quantum circuits over multipl...

C. Papon, Xiaoyan Zhou, H. Thyrrestrup +7 more·Nov 27, 2018

The active routing of photons using rapid reconfigurable integrated circuits is a key functionality for quantum-information processing. Typical waveguide-based optical switches rely on the modulation of the refractive index, producing a modest variat...

M. Schuld, V. Bergholm, C. Gogolin +2 more·Nov 27, 2018

An important application for near-term quantum computing lies in optimization tasks, with applications ranging from quantum chemistry and drug discovery to machine learning. In many settings --- most prominently in so-called parametrized or variation...

O. Gargiulo, S. Oleschko, J. Prat‐Camps +2 more·Nov 27, 2018

Fast magnetic flux control is a crucial ingredient for circuit quantum electrodynamics (cQED) systems. So far it has been a challenge to implement this technology with the high coherence 3D cQED architecture. In this paper we control the magnetic fie...

Timjan Kalajdzievski, J. Arrazola·Nov 26, 2018

We propose a method for decomposing continuous-variable operations into a universal gate set, without the use of any approximations. We fully characterize a set of transformations admitting exact decompositions and describe a process for obtaining th...

S. Takeda, Kan Takase, A. Furusawa·Nov 26, 2018

Programmable and on-demand generation of photonic entanglement is enabled by a dynamically controlled loop-based circuit. Quantum information protocols require various types of entanglement, such as Einstein-Podolsky-Rosen, Greenberger-Horne-Zeilinge...

A. M. Meier·Nov 25, 2018

Randomized benchmarking is an experimental procedure intended to demonstrate control of quantum systems. The procedure extracts the average error introduced by a set of control operations. When the target set of operations is intended to be the set o...

Cheng Shang, H. Z. Shen, X. Yi·Nov 25, 2018

In this work, we propose a scheme in three-mode optical systems to simulate a strongly coupled optomechanical system. The nonreciprocity observed in such a three-mode optomechanical circulatory system (OMCS) is explored. To be specific, we first deri...

Samuele Ferracin, Theodoros Kapourniotis, A. Datta·Nov 24, 2018

We present an accreditation protocol for the outputs of noisy intermediate-scale quantum devices. By testing entire circuits rather than individual gates, our accreditation protocol can provide an upper-bound on the variation distance between noisy a...

A. Bhatia, M. Saggi·Nov 24, 2018

The study of tensor network theory is an important field and promises a wide range of experimental and quantum information theoretical applications. Matrix product state is the most well-known example of tensor network states, which provides an effec...

H. Naus, R. Versluis·Nov 24, 2018

Surface codes based on stabilizer circuits may pave the way for large scale fault-tolerant quantum computation. The surface code uses only single- and two-qubit gates and the error threshold falls close to 1% for a large range of errors. Among the mo...

B. Villalonga, S. Boixo, Bron C. Nelson +4 more·Nov 23, 2018

Here we present qFlex, a flexible tensor network-based quantum circuit simulator. qFlex can compute both the exact amplitudes, essential for the verification of the quantum hardware, as well as low-fidelity amplitudes, to mimic sampling from Noisy In...

Asad Hussain, Hamza Ahmed·Nov 23, 2018

Modeling an arbitrarily accelerating qubit as an open quantum system, we derive an exact solution for the pure-dephasing model ($\sigma_z$ coupling) under arbitrary qubit space-time trajectories, as well as general expressions for the survival probab...

F. Arzani, A. Ferraro, V. Parigi·Nov 22, 2018

We introduce a high-dimensional quantum encoding based on coherent mode-dependent single-photon subtraction from multimode squeezed states. This encoding can be seen as a generalization to the case of non-zero squeezing of the standard single-photon ...

Sahar Daraeizadeh, S. Mostame, Preethika Kumar Eslami +2 more·Nov 22, 2018

We analytically designed the control bias pulses to realize new multi-qubit parity detector gates for 2-Dimensional (2D) array of superconducting flux qubits with non-tunable couplings. We designed two 5-qubit gates such that the middle qubit is the ...

T. Isdrailă, C. Kusko, R. Ionicioiu·Nov 22, 2018

One of the main challenges in quantum technologies is the ability to control individual quantum systems. This task becomes increasingly difficult as the dimension of the system grows. Here we propose a general setup for cyclic permutations Xd in d di...

Chuiping Yang, Zhen-Fei Zheng, Yu Zhang·Nov 21, 2018

Hybrid qubits have recently drawn intense attention in quantum computing. We here propose a method to implement a universal controlled-phase gate of two hybrid qubits via two three-dimensional (3D) microwave cavities coupled to a superconducting flux...

Hamza Jaffali, F. Holweck·Nov 21, 2018

In this paper, we study the nature of entanglement in quantum Grover’s and Shor’s algorithms. So far, the authors who have been interested in this problem have approached the question quantitatively by introducing entanglement measures (numerical one...